CVE-2023-35298: HTTP.sys Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2023-Jul

Released

2023-07-11

EPSS Score

0.67% (percentile: 71.3%)

FAQ

How could an attacker exploit this vulnerability? In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the Server Name Indication (SNI) over HTTP Protocol Stack (http.sys) to process packets, causing a denial of service (DOS).

Affected Products (6)

Windows

• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 11 version 21H2 for x64-based Systems
• Windows 11 version 21H2 for ARM64-based Systems
• Windows 11 Version 22H2 for ARM64-based Systems
• Windows 11 Version 22H2 for x64-based Systems

Security Updates (3)

• 5028171
• 5028182
• 5028185

Acknowledgments

Hong Hai with Alibaba Orion Security Lab

Revision History

• 2023-07-11: Information published.